CVE-2021-47254
Description
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix use-after-free in gfs2_glock_shrink_scan The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to remove the glock from the lru list in __gfs2_glock_put(). On the shrink scan path, the same flag is cleared under lru_lock but because of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the put side can be made without deleting the glock from the lru list. Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to ensure correct behavior on both sides - clear GLF_LRU after list_del under lru_lock.
How to fix
- linux linux_kernel4.4.274, 4.9.274, 4.14.238, 4.19.196, 5.1, 5.4.127, 5.10.45, 5.12.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.4.181 ≤ v < 4.4.274, 4.9.180 ≤ v < 4.9.274, 4.14.123 ≤ v < 4.14.238, 4.19.47 ≤ v < 4.19.196, 5.0.20 ≤ v < 5.1, 5.1.6 ≤ v < 5.4.127, 5.5 ≤ v < 5.10.45, 5.11 ≤ v < 5.12.12, 5.13 | 4.4.274, 4.9.274, 4.14.238, 4.19.196, 5.1, 5.4.127, 5.10.45, 5.12.12 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.